an acid with a pka of 8.0 is present in a solution with a ph of 6.0. what is the ratio of base to acid?

Answer:

The right answer is "236.53 g".

Explanation:

The given values are:

P = 1.09 atm

V = 186 liters

The reaction will be:

⇒  \(KClO_3 (s)\rightarrow 2Kcl(s)+3O_2(g)\)

The moles of O₂ will be:

=  \(\frac{PV}{RT}\)

On substituting the values, we get

=  \(\frac{1.09\times 186}{0.0821\times 850}\)

=  \(\frac{202.47}{69.785}\)

=  \(2.90 \ moles\)

Now,

1 mole O₂ is produced from

= \(\frac{2}{3} \ mol \ KClO_3\)

then,

2.90 mole O₂ is produced from 2 mol KClO₃

= \(\frac{2}{3}\times 2.90\)

= \(1.93 \ mol \ KClO_3\)

hence,

The number of grans of solid in the engine will be:

= \(1.93\times 122.55\)

= \(236.53 \ g\)

The fundamental nature of strategic management requires the awareness & understanding of outside forces & encourages strategic managers to adopt new ideas is known as Adaptation.

Three definitions of adaptability are connected. First, natural selection, a dynamic evolutionary process, adapts organisms to their environments, improving their evolutionary fitness. Second, it is a state that the populace has attained along that process. Thirdly, it is a phenotypic characteristic or adaptive trait that has been preserved and has evolved via natural selection and has a functional purpose in each individual organism.

History has recorded descriptions of adaptation going back to the time of the ancient Greek philosophers Empedocles and Aristotle. Natural theology of the 18th and 19th centuries saw adaptation as proof of the presence of a deity.

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Answer:

why do people add sugar to drinks to make them sweeter

Answer:

Explanation:

Digestion begins in the mouth with the secretion of saliva and its digestive enzymes. In the stomach further release of enzymes break down the food further and this is combined with the churning action of the stomach. The partially digested food enters the duodenum as a thick semi-liquid chyme.

The density of CO2 gas at STP conditions is 1.8926 g/L if 2.50 g of CO2 occupies 5.60 L at 789 torr. This calculation was done using the ideal gas law and the formula ρ = m / V.

Given conditions:

Mass (m) = 2.50 g

Volume (V) = 5.60 L

Pressure (P) = 789 torr

Standard Temperature and Pressure (STP) conditions:

Temperature (T) = 273.15 K (0°C)

Pressure (P) = 1 atm (760 torr)

Molar mass of CO2 = 44.01 g/mol

Using the ideal gas law (PV = nRT), we can calculate the number of moles of CO2:

n = m / MM

n = 2.50 g / 44.01 g/mol

n = 0.0568 mol

Using the ideal gas law again, we can calculate the volume at STP:

V = nRT / P

V = (0.0568 mol x 0.08206 L atm / mol K x 273.15 K) / (1 atm)

V = 1.3219 L

Now, we can find the density of CO2 at STP:

ρ = m / V

ρ = 2.50 g / 1.3219 L

ρ = 1.8926 g/L

Therefore, the density of CO2 gas at STP conditions is 1.8926 g/L if 2.50 g of CO2 occupies 5.60 L at 789 torr. This calculation was done using the ideal gas law and the formula ρ = m / V.

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184 gm is the original sample weight of carbon.

The radioactive form of carbon is C-14 because of having too many neutrons and six protons, which makes it unstable. 

The carbon decays through the beta process. The radioactive carbon decays by half every 5730 years.

According to the question,

 years of decaying carbon = 22,920 

After decaying, the weight of carbon is 46 g. 

Because the original sample size is 5730 years, half of the carbon sample decays similarly. 

22920/5730 = 4

It means 1/4 of the sample decays = 46.0 gm (given). 

As we need to find the original sample, 4*46 = 184 gm. 

Hence, the original sample of carbon will be 184 gm.

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Solids exhibit the strongest intermolecular force of attraction.

Particles in a petrol have relatively little attraction to one another. In comparison to the particles in a solid or liquid, they are constantly moving and quite far apart. As the particles collide, they just hit one other and bounce off of one another without engaging in any interaction.

Compared to liquids and gases, solids usually exhibit the highest intermolecular forces. Because the particles in solids are tightly packed, they are incompressible and have a high density.

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There is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off

Soil erosion is influenced by various factors, including slope steepness, rainfall intensity, soil characteristics, vegetation cover, and land management practices. As slope steepness increases, the potential for soil erosion generally increases due to the gravitational force acting on the eroded materials. However, there is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off. The relationship between slope steepness and soil erosion is generally non-linear. At low slope angles, soil erosion tends to be minimal as the gravitational force is relatively weak. As the slope angle increases, soil erosion typically increases exponentially due to the increased force of gravity. Eventually, as the slope steepness continues to increase, soil erosion may reach a point of maximum potential where the erodibility of the soil and other factors become limiting factors. Beyond this point, the rate of soil erosion may start to taper off, but it does not completely stop. Instead, it may stabilize or decrease slightly compared to the maximum erosion potential observed at steeper slopes.

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Answer:

1. Gases may be compressed

2. Gases expand when less pressure is applied.

3. Gases can be mixed.

4. Gases exert a constant pressure on its container walls.

5. Gases have low densities.

Answer:

Lithium chloride + Iron

No reaction takes place, because lithium is more reactive than iron, so Iron cannot displace lithium from its solution.

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Yes, \(Br^{-}\) and \(Cl^{-}\) ions both can be positively identified through  precipitation reaction or precipitimetry.

Through titration employing precipitation reaction or precipitimetry, these two ions can both be positively identified. When exposed to Cl- and Br- ions, AgNO3 transforms into silver halides. AgNO3 with Cl- ions precipitates white because AgCl is not particularly soluble in water, whereas AgNO3 with Br- ions precipitates cream.

A very light cream precipitate results from mixing cream and white ppt.

Both halides react as described below:

\(AgNO_{3}+ XCl\)\(= AgCl_{whiteppt.}\)

\(AgNO_{3}+ XBr\) \(= AgBr_{creamppt.}\)

Now, While AgBr does not dissolve in diluted ammonia, this AgCl precipitate does to create an Ag-diammonium ion combination. Two facts, including the fact that the ppt shade is now darker than the prior pale cream, demonstrate this. As a result of the addition of an ammonia solution, it becomes less concentrated, although some cream precipitates persist.

Second, concentrated ammonia dissolves the AgBr precipitate. AgBr precipitates dissolve when cream precipitate is filtered and concentrated ammonia is added. In solution Br- ions are confirmed by this.

\(Ag^{+}+NH_{3}\) ⇄ \((AgNH_{3} )_{2} ^{+}\)

The foregoing reaction switches in the right direction after the addition of diluted ammonia solution, and more and more Ag+ ions are complexed, producing the soluble form of Ag-diammonium complex.

Brown globules are produced when CHCl3 is added to the mixture and agitated.

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Answer:

I don’t know what recording station you’re referring to but, When seismic waves reach the seismograph, a graphical record, or seismogram, is produced

Explanation:

The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.

The seismic wave has been the radiation, with the result of the movement of the earth surface. The movement has been result in the earthquake.

The intensity of the earthquake has been measured by seismograph on the Richter scale. The seismic wave results in the movement of the leads to the production of the seismograph.

The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.

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Explanation:

This explanation is the opposite of true testing - a term known as falsifiability. Falsifiability, when it relates to science, refers to how it should be possible to prove a hypothesis or theory wrong. Thus, the point of testing for falsifiability is to test in which condition is the theory wrong.  

A term that might relate to the phrase ‘true testing’ used in the question would be testability. Which refers to the practice of testing a hypothesis or theory to see whether it is true or false.  

True testing has been the scientific method that uses various steps to conclude the findings. "True testing means that a serious effort is made to create experiments that support your hypothesis." Thus, option B is correct.

True testing has been defined as the assessment scientific method that is involved in solving the question and issue by formulating the hypothesis and then researching the possible observations and solution that concludes and proves the findings.

It falsifies or proves the hypotheses right or wrong based on the experimental design setup. It does not falsify each possible explanation, nor is always fully correct. It also is not conducted to support the manufacturing and support it financially.

Therefore, option B. True testing experiments to sustain the hypothesis.

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Answer: B 8.40 g

Explanation:

Answer:

A protein is a polymer that is made of amino acids.

Answer:

A. PO4^3-

Explanation:

took the quiz on a pex

The conjugate base of HPO₄²⁻ is PO₄³⁻. Therefore, option (A) is correct.

The Bronsted-Lowry concept can be explained as an acid-base reaction where base and acid react with each other and by an exchange of proton acid, forms its conjugate base and the base generates its conjugate acid.

The Bronsted-Lowry theory is an extended version of Arrhenius's theory of acid-base. According to this concept, acid can be defined as a substance that donates a hydrogen ion or a proton and produces its conjugate base and the base can be defined as a substance that accepts a proton and creates its conjugate acid.

Bronsted-Lowry acid in the dissociation form can be represented as:

Acid   ⇄   Conjugate base +   H⁺

The conjugate base of Bronsted-Lowry acid HPO₄²⁻ can be represented as follows:

HPO₄²⁻   ⇄  PO₄³⁻ +   H⁺

Therefore, PO₄³⁻ is the conjugate base of the Bronsted-Lowry acid HPO₄²⁻​.

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WHAT- WHAT GRADE R YOU IN 0,0

Answer: It is a 2:3 ratio because Al has a +2 charge and S and O both have a -2 charge. It takes 2 Al to bring 3 SO3 to a neutral state.

Explanation:

The statement that shows an example that demonstrates the reversibility of a chemical change is rotting of eggs (option B).

A chemical change is any process in which reactants are changed into products by the breaking or creation of chemical bonds.

Chemical changes are opposed to physical change, which only affects the form of a chemical substance, but not its chemical composition.

Examples of chemical changes are as follows:

Therefore, it can be said that rotting process of an egg is an example of a reversible chemical change.

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Answer:

Recharging batteries.

I just took the quick check

Explanation:

If your here for the Physical vs. Chemical Change Quick check for Connexus, here are the answers.

1- Dry ice becoming vapor

2-iron (Fe) reacting to water((H2O)) and oxygen(O) to form iron oxide(Fe2O3)

3-conduct a test to determine the chemical makeup of the molecules

4-Atoms of one or more substances rearrange into a new substance.

5-recharging batteries

I took the quick check, and these were the answers!!

                        Hope this helps someone!

The ionic compound between each pair of elements has the following formula:

(a) Al₂S₃

(b) AlN

(c) K₂O

(d) SrI₂

(e) MgO

(f) BaF₂

(g) SrS

(h) Be₃N₂

The formula for the ionic compound for each pair is:

(a) Aluminium and Sulfur

Aluminum sulfide, also known as Al₂S₃, is created when aluminum and sulfur combine. Its molar mass is 150.158 g/mol. Al has a +3 oxidation state while the sulfur in Al₂S₃ is in a -2 oxidation state.

Al⁺³ + S⁻² → Al₂S₃

(b) Aluminium and Nitrogen

Solid aluminum nitride is known as aluminum nitride (AlN). It is an electrical insulator with high thermal conductivity of up to 321 W/(mK).

Al⁺³ + N⁺³ → AlN

(c) Potassium and Oxygen

When potassium and oxygen are combined, potassium oxide results as an ionic molecule. It has the chemical composition K₂O. Because it is highly reactive, potassium cannot be found in its free form. It easily forms K₂O when combined with oxygen atoms due to its +1 valency.

( K₂ )⁺¹ + O²⁻ → K₂O

(d) Strontium and iodine

Ions of strontium and iodide combine to form the ionic compound known as strontium iodide.

Strontium has the chemical symbol Sr and a valency of +2. Iodine also bears the symbol I and the valency of -1.

(Sr)⁺² + I⁻¹ → SrI₂

(e) Magnesium and Oxygen

Magnesium oxide MgO) is created through the ionic interaction of magnesium (Mg) with oxygen (O₂). While oxygen has six valence electrons, magnesium only has two.

Mg⁺² + O²⁻ → MgO

(f) Barium and Fluorine

Because it is made up of a barium cation with a +2 charge and a fluoride anion with a charge of 1, barium fluoride is an ionic compound. This substance has the chemical formula BaF₂.

Ba²⁺ + F⁻¹ → BaF₂

(g) Strontium and Sulfur

Strontium serves as the anion and sulfur is the cation. Due to its presence in Group II, strontium has a valency of 2. The sulfur atom will gain 2 electrons and currently has 6 electrons in its outermost shell. Sulfur's valency is therefore 2.

Sr⁺² + S²⁻ → SrS

(h) Beryllium and Nitrogen

Because nitrogen is a non-metal and beryllium is a metal, an ionic link is created between the two. Be₃N₂ is formed when Beryllium and nitrogen is reacted.

Be²⁺ + N³⁻ → Be₃N₂

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The complete question is mentioned below:

Write a formula for the ionic compound that forms between each pair of elements.

a. Aluminum and Sulfur

b. Aluminum and Nitrogen

c. Potassium and Oxygen

d. strontium and iodine

e. magnesium and oxygen

f. barium and fluorine

g. strontium and sulfur

h. beryllium and nitrogen

Answer:

An -ite or -ate ending means a polyatomic ion that includes oxygen is in the formula.

ate = one more O than -ite

Explanation:

Example:

NO2 is nitrite

NO3 is nitrate

You can see that the molecules are made of the same elements, however they have more or less of one of the elements (i.e. oxygen).

These suffices are used in oxygen compounds

Take example of Sulphur

ite means 2 and ate means 3

The metal spoon is hotter than the wooden spoon due to its higher mass,

Heat is the energy transferred from one body to another due to a temperature difference. The amount of heat transferred is proportional to the mass of the object and its specific heat capacity. Specific heat capacity is the amount of heat required to raise the temperature of one unit mass of the substance by one degree Celsius.

In this scenario, the two spoons are of equal size, but the metal spoon has a higher mass and specific heat capacity compared to the wooden spoon. When both spoons are placed in the boiling water, heat flows from the water to the spoons until they reach the same temperature as the water.

However, due to the higher mass and specific heat capacity of the metal spoon, it requires more heat energy to raise its temperature compared to the wooden spoon. As a result, the metal spoon takes a longer time to reach the same temperature as the wooden spoon.

Additionally, metals are better conductors of heat compared to wood. Therefore, the metal spoon conducts the heat more efficiently from the boiling water to the handle, making it hotter than the wooden spoon.

Overall, the metal spoon is hotter than the wooden spoon due to its higher mass, higher specific heat capacity, and better heat conduction properties. This is why it would be more painful to grab.

Your lab write-up confirmed that the third mechanism, which involves an iodide ion and a persulfate ion coming together, is the rate determining step for your experiment.

If the first mechanism is correct (two iodide ions coming together), then doubling the concentration of iodide ions would increase the rate of the reaction. This is because the rate-determining step involves two iodide ions coming together, so increasing the concentration of iodide ions would increase the likelihood of this step occurring.

If the first mechanism is correct, then doubling the concentration of persulfate ions would not have any effect on the rate of the reaction. This is because the rate-determining step does not involve persulfate ions, so increasing their concentration would not affect the rate.

If the second mechanism is correct (persulfate ion decomposing), then doubling the concentration of iodide ions would not have any effect on the rate of the reaction. This is because the rate-determining step does not involve iodide ions, so increasing their concentration would not affect the rate.

If the second mechanism is correct, then doubling the concentration of persulfate ions would increase the rate of the reaction. This is because the rate-determining step involves persulfate ions decomposing, so increasing their concentration would increase the likelihood of this step occurring.

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Answer: The density of the rock is 2g/mL. Hope this helped! :)

Explanation:

V= 3.0mL                                                               D=M/V

M= 6.0g

D=6.0g/3.0mL

D= 2.0g/mL

The specific heat of the metal is 21,695.047 J/g/deg

The water will develop heat as a result of heat being transmitted from the hot metal to the colder water. The metal and the water will both be the same temperature (56C) at the conclusion.

The heat (q) is determined by multiplying the mass (m) by the specific heat (C) and the temperature change (ΔT).

q = mC∆T

For the metal: q = (2.34kg) (C J/g/deg) (129deg - 88deg)

                        q = 301.86- 205.92

                        q = 95.94 C

For the water: q = (15,546g) (4.184 J/g/deg) (88 deg - 56 deg) 

= 65,044.464*88 - 65,044.464*56

= 2081422.848 J

95.94 C = 2081422.848

C = 2081422.848/95.94 = 21,695.047

C = 21,695.047 J/g/deg --> specific heat of the metal

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Answer: B. Super PACs should not receive contributions from corporations.

Explanation: Mayor de Blasio's position on super PACs is that they should not receive contributions from corporations. This is in line with his slogan, "No Corporate Money," which suggests that corporations should not be allowed to use their finances to influence campaigns.

Based on the slogan "No Corporate Money,”  the statement that best explains de Blasio’s position on super PACs is - "Super PACs should not receive contributions from corporations."

Super PACs receiving funding from corporations is against De Blasio's position which is reflected in the campaign slogan "No Corporate Money." He probably thinks corporate influence in politics should be kept to a minimum in order to promote a more fair and open electoral system. This viewpoint is in line with the notion that corporate funding may influence judgment and thwart sincere public interest representation.

De Blasio seeks to lessen the possibility of excessive corporate influence over candidates and policies by opposing corporate contributions to super PACs encouraging a more democratic and people  centered approach to political campaigning and governance.

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Calculating this equation will give us the average translational kinetic energy of one molecule in the given ideal gas at 97.3°C.

To determine the average translational kinetic energy of a molecule in an ideal gas, we can use the equation:

E = (3/2) * k * T

Where:

E is the average translational kinetic energy

k is the Boltzmann constant (k = 1.380649 × 10^−23 J/K)

T is the temperature in Kelvin

First, let's convert the temperature from Celsius to Kelvin by adding 273.15:

T = 97.3°C + 273.15 = 370.45 K

Now we can calculate the average translational kinetic energy:

E = (3/2) * k * T

= (3/2) * (1.380649 × 10^−23 J/K) * (370.45 K)

T = 97.3°C

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Answer: EPA regulates the production and distribution of commercial and industrial chemicals, in order to ensure that chemicals for sale and use in the United States do not harm human health or the environment.

Explanation: